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Flashcards in Transformers Deck (4)
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Why does a transformer not work with direct current?

A changing magnetic field is necessary to induce ac in the secondary coil.

1

Complete the statement with these words:
Current, magnetic field, pd, primary, secondary

In a transformer, an alternating ________ is passed through the ________ coil. This coil creates an alternating ________ that passes through the ________ coil. As a result, an alternating ________ is induced in the ________ coil.

In a transformer, an alternating current is passed through the primary coil. This coil creates an alternating magnetic field that passes through the secondary coil. As a result, an alternating pd is induced in the secondary coil.

2

Why is it important that the coil wires of a transformer are insulated?

If they were, the current would pass through the iron core and there would be no change in potential difference.

3

Why is the core of a transformer made of iron?

It does not retain it's magnetic charge when the magnetic field is reduced.
It can withstand very strong magnetic fields